Variable rate communication method and a variable rate communica

Details Variable rate communication method and a variable rate communica Variable rate communication method and a variable rate communica

1994-07-07

1997-05-06

Gordon, Paul P.

Excavating

371 41, 370468, G06F 1110, H04J 322

Patent

active

056278454

ABSTRACT:
In variable bit rate communications in which the information rate changes at B/2.sup.n (where n is 0 or a positive integer) in each frame when the maximum information rate is B, at the transmitter side, information data is convolution coded in order to carry out an error correction of the information data, and when n.gtoreq.1, coded data is repeatedly transmitted by (2.sup.n -1) times. At the receiver side, the information rate is detected from the transmission data that has been received, and when carrying out Viterbi decoding, an information rate is estimated by utilizing the repetition characteristics of the data, so that the coded data is Viterbi decoded for only the estimated bit rate, to thereby restrict an increase in the power consumption of mobile terminal units that are driven by batteries.

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Allen Salmasi et al., "On The System Design Aspects Of Code Division Multiple Access (CDMA) Applied To Digital Cellular And Personal Communications Networks", May 1991 41st IEEE Vehicular Technology Conference, pp. 57-62.
A.J Viterbi; "Very Low Rate Convolutional Codes for Maximum Theoretical Performance of Spread-Spectrum Multiple Access Channels"; IEEE Journal on Selected Areas In Communications, May 1990.
IEEE Journal of Solid-State Circuits, vol. 28, No. 3, pp. 253-260, Mar. 1993, "CDMA Mobile Station Modem ASIC", Hinderling, et al.

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